361 



hi piaces where thc tide is imperceptible , e. g. in Sundene 

 between Stromo and Oslerci and in Skaalefjord, this species occurs 

 in quite shallow water, olien bardly a foot below tbe surface. But 

 where the tide is felt, e. g. at Klaksvig it grows at so great a depth 

 as to be hardly left dry except at very low ebb-tide. I only found 

 it in particularly sheltered piaces, but Rostrup and Lyngbye 

 gathered it near Thorshavn, consequently, from a more exposed 

 locality. Grows most frequently on stones and rocks, but some- 

 times also attached to other algæ. 



Tetraspore -bearing specimens were found in May, June and 

 July; cystocarpic in August, September and October, which agrees 

 fairly well with Kleen's report (1. c. p. 18) from Nordland. 



This species, which was first reported from the Færoes by Rostrup, 

 was already found there by Lyngbye as what he calls Gigartina 

 pinastroides, is this species which was proved by examining the spe- 

 cimens preserved in his herbarium. In Hydrophyt. he mentions it as 

 follows: — Habitat ad insulas Færoenses, ut in sinu prope Thorshavn, 

 at raro.« But Lyngbye must have been very doubtful as to the cor- 

 rectness of his determination, for to begin with he labelled the spe- 

 cimens in question Fucus purpurascens , then he put them in a small 

 wrapper on which he wrote »pinastroides«, and this wrapper with con- 

 tents was again placed among his material of Cystoclonium purpurascens, 

 where it was found by Dr. Rosenvinge some years ago when he 

 arranged Lyngbye's Herbarium; so Lyngbye himself must have dis- 

 covered his error. 



This species does not appear to be widely distributed along the 

 shores of the Færoes: — 



Bordo: Klaksvig (Rostr., H. S. !); Ost: Glibre X, Strænder H. J. !); 

 Str. : Sundelaget (!), Kvalvig (!), Thorshavn Lyngb., Rostr.). 



EUTHORA. J. Ag. 



24. E. cristata (L.) J. Ag. Kjellm., N. I., p. 186 (145); Spærococcus 

 cristatus Lyngb., Hydrophyt., p. 13. 



There occur two forms of this species, a broader and more 

 robust form — f. typica peculiar to exposed localities, and a nar- 

 rower but larger form — f. angustata Lyngb., which I have only 

 met with in sheltered piaces in fjords or narrow sounds. 



This species generally occurs in the sublittoral zone, and 

 luxuriant specimens were found down to a depth of 25 fathoms. 

 In caves I found it almost at the waters edge, but hardly so far 

 up as to be left uncovered at ebb-tide. Kleen (1. c. p. 17) mentions 

 very much the same occurring in Nordland. It was met with in 



